CN112077158B - Metal plate strip grinding and descaling device and method - Google Patents
Metal plate strip grinding and descaling device and method Download PDFInfo
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- CN112077158B CN112077158B CN201910504270.9A CN201910504270A CN112077158B CN 112077158 B CN112077158 B CN 112077158B CN 201910504270 A CN201910504270 A CN 201910504270A CN 112077158 B CN112077158 B CN 112077158B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/06—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing of strip material
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention discloses a metal plate strip grinding and descaling device and a method, wherein the device comprises a descaling box body (2), abrasive particles (3), a grinding roller (4), an abrasive supplying device (5), a recovery feeding channel (6), a collecting tank (10) and a separation filtering device (13); the grinding roller is arranged in the descaling box body, and the upper grinding roller and the lower grinding roller are symmetrical relative to the metal plate strip (1); the recovery feed channel is arranged on the descaling box body and connected with the abrasive supplying device, and abrasive particles are stored in the abrasive supplying device and are input into the descaling box body through the recovery feed channel; the collecting tank is communicated with the bottom of the descaling box body and the separation and filtration device, an effective particle outlet of the separation and filtration device is connected with the grinding material supply device, and an ineffective particle outlet is connected with the collecting barrel (19). The invention can realize quick and efficient descaling and surface cleaning of continuously passing metal strips, effectively solves the problems of thick scale and difficult removal of the edge of the metal strips, and realizes consistent descaling quality in the width direction of the metal strips.
Description
Technical Field
The invention relates to surface treatment equipment and a surface treatment method for a metal plate strip, in particular to a metal plate strip grinding and descaling device and a metal plate strip grinding and descaling method.
Background
The metal material can form a layer of compact metal oxide, commonly called as scale, on the surface in the process of hot rolling or heat treatment. Before the metal material is subjected to subsequent processing treatment, the scale of the layer must be removed, otherwise, the scale of the layer can bring adverse effects to the quality of finished products of subsequent processes and processing equipment, such as: when the residual scale is subjected to cold rolling, the scale is pressed into a metal matrix, so that the scale pressing defect is caused, and the roller is damaged; the scale also influences the coating quality of the workpiece, and causes the defects of missing coating, uneven coating quality, substandard coating binding power and the like.
At present, the traditional scale removing technology mainly adopts chemical pickling and dry blasting, but the pickling has a series of problems of acid mist emission, severe working environment, huge equipment, high investment cost and the like, the dry blasting also has the problems of dust emission, dust explosion risk and unsatisfactory descaling quality, and the conventional descaling technology can not meet the requirement of environmental-friendly production in the metallurgical industry more and more.
In recent years, researchers in related fields of various countries actively explore various novel descaling technologies, typically including abrasive jet descaling, plasma descaling, hydrogen reduction descaling, laser descaling and the like, wherein the development and industrial application of the abrasive jet descaling are fastest, and the method is mainly used for surface descaling of various pipe and tube materials, bars and narrow strips. The american TMW company, which has developed relevant research abroad, is typically represented, and the developed EPS technology is marketed and popularized in 2010, so that a plurality of EPS board/roll production lines have been increasingly popularized. However, the abrasive jet descaling technology still has a plurality of process problems to be solved: (1) The complexity of a process system is high, so that the failure rate and the maintenance workload of equipment are high; (2) When wide-specification strip steel is processed, the control on the scale removal rate and the surface roughness uniformity is not ideal; (3) The method of adopting the abrasive jet to beat is adopted for descaling, the effective energy utilization rate is lower, and the energy consumption of equipment is high.
The invention patents GB2173722B, GB2202474B and US5009037 applied by Sunji researchers disclose a series of descaling devices/descaling boxes for strip steel, wherein a closable blade is used for squeezing abrasive materials to clamp strip steel to achieve grinding and descaling, and an electromagnetic device is arranged on the outer side of the blade to improve the enrichment and retention capacity of the abrasive materials in the blade area. US4187081 discloses a device for descaling sheet material using ferromagnetic abrasive material, which uses rollers with magnetic particles attached to their surfaces to abrade and descale sheet material passing between the nip surfaces, but this method also suffers from the problem of being non-continuous and only being applicable to intermittent descaling of individual sheet materials.
Disclosure of Invention
The invention aims to provide a metal plate strip grinding descaling device and a metal plate strip grinding descaling method, which can realize quick, efficient and continuous descaling and surface cleaning of continuously passing metal plates and strips, can effectively solve the problems that scale on the edges of the metal plates and strips is thick and difficult to remove, and realize consistent descaling quality in the width direction of the metal plates and strips.
The invention is realized by the following steps:
a metal plate strip grinding and descaling device comprises a descaling box body, abrasive particles, a grinding roller, an abrasive supplying device, a recovery feeding channel, a collecting tank and a separation filtering device; the middle parts of the front end and the rear end of the descaling box body are respectively provided with an inlet slit and an outlet slit, so that the metal plate strip enters the descaling box body through the inlet slit and is output through the outlet slit; the grinding rollers are arranged in the descaling box body and comprise a plurality of upper grinding rollers which are distributed above the metal plate strip at intervals and a plurality of lower grinding rollers which are distributed below the metal plate strip at intervals, and the upper grinding rollers and the lower grinding rollers are in one-to-one correspondence and are symmetrically arranged relative to the metal plate strip; the plurality of recovery feeding channels are respectively arranged at intervals at the top of the descaling box body and are connected with an outlet of the abrasive supplying device, the plurality of recovery feeding channels are respectively and correspondingly positioned above the plurality of upper grinding rollers, abrasive particles are stored in the abrasive supplying device and are input into the descaling box body through the plurality of recovery feeding channels, and the abrasive particles are extruded and rubbed with the scale on the surface of the metal plate strip through the rotating grinding rollers; the collecting tank is arranged at the bottom of the descaling box body and is communicated with the descaling box body, an outlet at the bottom of the collecting tank is connected with an inlet of the separation filtering device, an effective particle outlet of the separation filtering device is connected with an inlet of the abrasive material supply device, so that effective abrasive material particles accumulated in the collecting tank are recycled into the abrasive material supply device, and an ineffective particle outlet of the separation filtering device is connected with the collecting barrel.
The descaling box is characterized in that a plurality of flushing nozzles are arranged at the rear end of the inside of the descaling box body, the plurality of flushing nozzles are symmetrically arranged above and below the metal plate strip and are connected with a water outlet of the water pump, the nozzle outlet directions of the plurality of flushing nozzles form acute included angles with the metal plate strip, and the water inlet of the water pump is connected with a liquid outlet of the separation and filtration device.
The descaling box body is provided with a plurality of grinding roller gap adjusting devices, one ends of the grinding roller gap adjusting devices are arranged in the descaling box body and connected with the grinding rollers, and the grinding rollers move up and down through the grinding roller gap adjusting devices.
The outer contour of the grinding roller is uniformly distributed with sawtooth structures, so that the clearance between the outer contour of the rotating grinding roller and the metal plate strip is periodically changed.
The grinding roller is a linear profile grinding roller, side baffles are arranged on the outer sides of two ends of the linear profile grinding roller, and the side baffles cover two sides of the metal plate strip and the linear profile grinding roller.
The grinding roller is a curved profile grinding roller, the curved profile grinding roller is a curved roller with a small middle roller diameter and large two-end roller diameter, a long and narrow oval space with a large middle gap and small two-side gaps is formed between two curved profile grinding rollers which are symmetrically arranged up and down, and the curved profile grinding roller can axially move.
The granularity range of the abrasive particles is 40-100 meshes, the abrasive particles are in a polyhedral structure with a plurality of sharp corners and sharp edges on the surface, and the hardness of the abrasive particles is HRC45-65.
And a filtering screen is arranged in the descaling box body and is positioned below the lower grinding roller, and the aperture of meshes of the filtering screen is smaller than the outer diameter of effective abrasive particles.
The front side of the filtering screen is provided with a front baffle, the rear side of the filtering screen is provided with a rear baffle, and gaps are respectively reserved between the front baffle and the rear baffle as well as between the metal plate strip and the metal plate strip.
A metal plate strip grinding descaling method comprises the following steps:
step 1: the abrasive supplying device sends abrasive particles into the descaling box body through the recovery feeding channel;
step 2: the metal plate strip enters the descaling box body from the entrance slit and is transmitted between the upper grinding roller and the lower grinding roller;
and step 3: driving the upper grinding roller and the lower grinding roller to do rotary motion, so that the abrasive particles grind and descale the surface of the metal plate strip;
and 4, step 4: after being washed by a plurality of washing nozzles through a water pump, the metal plate strip after being ground and descaled is horizontally transmitted to an outlet slit;
and 5: the abrasive particles and liquid are collected in a collection tank;
step 6: particles and liquid in the collecting tank pass through a separation and filtration device, the separation and filtration device conveys effective abrasive particles to an abrasive material supply device, outputs ineffective abrasive particles and scales to a collecting barrel, and conveys filtered clean water to a flushing nozzle through a water pump;
and 7: and (6) circulating the steps from the step 3 to the step 6 until the strip tail of the metal strip is output to an outlet slit of the descaling box body.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention utilizes the abrasive particles to grind the scale of the metal plate strip, the kinetic energy for descaling and descaling is directly transmitted to the abrasive particles and applied to the surface of the metal plate strip to be processed during grinding, and in the traditional abrasive jet descaling mode, the abrasive particles not only overcome the air resistance in the flight process, but also consume a part of the kinetic energy in forms of reflection, bounce and the like after striking the plate surface.
2. The continuous descaling device can continuously descale the metal plate strip, and can complete the continuous updating of abrasive particles while descaling, thereby ensuring the stability of production and descaling quality.
3. The invention has the advantages of small equipment occupation area, compact structural arrangement, simple and reliable system composition, and can obviously reduce the construction cost, improve the reliability of the process and simultaneously reduce the maintenance cost.
4. According to the invention, through the matching of the curve profile grinding roller and the roll gap adjusting mechanism, the flexible matching of metal plate strips with different width specifications and different scale characteristics can be realized, and the maximum descaling energy efficiency is exerted.
According to the invention, the toothed grinding roller is used for driving abrasive particles to perform extrusion grinding on the metal plate strip, so that continuous synchronous grinding, clearing and flushing of the scale on the upper surface and the lower surface of the metal plate strip are realized; meanwhile, the grinding roller with the curved profile is used, the strengthening treatment of the edge area of the metal plate strip can be realized, the grinding roller with the curved profile can be matched with the metal plate strips with various width specifications through axial movement, the descaling efficiency is improved, and finally the metal plate strip with the surface free of scale residue, clean and up-to-standard surface roughness is obtained.
Drawings
FIG. 1 is a front view of a sheet metal strip grinding and descaling apparatus according to the present invention;
FIG. 2 is a front view of a straight profile grinding roll in the metal strip grinding and descaling apparatus of the present invention;
FIG. 3 is a front view of a curved profile grinding roll in the sheet metal strip grinding and descaling apparatus of the present invention;
FIG. 4 is a front view showing the play of the grinding roll with curved profile in the metal strip grinding and descaling apparatus according to the present invention;
FIG. 5 is a partially enlarged view of the sheet metal strip grinding and descaling apparatus of the present invention;
FIG. 6 is a flow chart of the method for grinding and descaling sheet metal strip according to the present invention.
In the figure, 1 metal plate strip, 2 descaling box bodies, 3 abrasive particles, 4 grinding rollers, 5 abrasive supplying devices, 6 recovery feeding channels, 7 grinding roller gap adjusting devices, 8 flushing nozzles, 9 filtering screens, 10 collecting tanks, 11 front baffles, 12 rear baffles, 13 separation filtering devices, 14 inlet slits, 15 outlet slits, 16 upper transition guide plates, 17 lower transition guide plates, 18 water pumps, 19 collecting tanks, 20 linear profile grinding rollers, 21 curved profile grinding rollers and 22 side baffles.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 1, the metal plate strip grinding and descaling device comprises a descaling box body 2, abrasive particles 3, a grinding roller 4, an abrasive supplying device 5, a recovery feeding channel 6, a collecting tank 10 and a separating and filtering device 13; the middle parts of the front end and the rear end of the descaling box body 2 are respectively provided with an inlet slit 14 and an outlet slit 15, so that the metal plate strip 1 enters the descaling box body 2 through the inlet slit 14 and is output through the outlet slit 15; the grinding rollers 4 are arranged in the descaling box body 2, the grinding rollers 4 comprise a plurality of upper grinding rollers which are distributed above the metal plate strip 1 at intervals and a plurality of lower grinding rollers which are distributed below the metal plate strip 1 at intervals, and the upper grinding rollers and the lower grinding rollers are in one-to-one correspondence and are symmetrically arranged relative to the metal plate strip 1; the plurality of recovery feeding channels 6 are respectively arranged at intervals at the top of the descaling box body 2 and are connected with an outlet of the abrasive material supply device 5, the plurality of recovery feeding channels 6 are respectively and correspondingly positioned above the plurality of upper grinding rollers, the abrasive particles 3 are stored in the abrasive material supply device 5 and are input into the descaling box body 2 through the plurality of recovery feeding channels 6, and the abrasive particles 3 are extruded and rubbed with the scale on the surface of the metal plate strip 1 through the rotating grinding rollers 4; the collecting tank 10 is arranged at the bottom of the descaling box 2 and is communicated with the descaling box 2, an outlet at the bottom of the collecting tank 10 is connected with an inlet of the separation and filtration device 13, an effective particle outlet of the separation and filtration device 13 is connected with an inlet of the abrasive supply device 5, so that the effective abrasive particles 3 accumulated in the collecting tank 10 are recycled into the abrasive supply device 5, and an ineffective particle outlet of the separation and filtration device 13 is connected with the collecting barrel 19.
The rear end of the interior of the descaling box body 2 is provided with a plurality of flushing nozzles 8, the plurality of flushing nozzles 8 are symmetrically arranged above and below the metal plate strip 1 and are connected with a water outlet of a water pump 18, the nozzle outlet directions of the plurality of flushing nozzles 8 and the metal plate strip 1 form acute included angles which are generally 10-45 degrees, preferably 15-25 degrees, and a water inlet of the water pump 18 is connected with a liquid outlet of a separation filtering device 13. The washing nozzle 8 is used for washing abrasive particles, scales and the like remained on the surface of the metal plate strip 1, so that no solid particles are remained on the surface of the metal plate strip 1 moved out of the descaling box body 2, and the washed liquid flows into the collecting tank 10 and is simultaneously recovered with the particles and the scales.
Preferably, the separation and filtration device 13 can use known technologies and equipments such as cyclone separator, centrifugal separator, magnetic filter, etc. to separate and filter the solid-liquid mixed medium flowing out from the collection tank 10: firstly, screening effective abrasive particles 3 which can be used continuously and conveying the effective abrasive particles to an abrasive supplying device 5 to participate in subsequent descaling work; then filtering ineffective abrasive particles 3 and scales in the water body and outputting the ineffective abrasive particles and the scales to a collecting barrel 19, so as to facilitate post-treatment; then the filtered clean water body is conveyed to the washing nozzle 8 through the water pump 18; the effective recycling of the abrasive particles 3 and the water body is realized, and the continuous supply of the abrasive particles 3 and the water body into the descaling box body 2 can be ensured.
The descaling box body 2 is provided with a plurality of grinding roller gap adjusting devices 7, one end of each grinding roller gap adjusting device 7 is arranged in the descaling box body 2 and is connected with a grinding roller 4, the grinding roller 4 moves up and down through the grinding roller gap adjusting devices 7, the grinding roller gap adjusting devices 7 and the grinding rollers 4 are arranged in a one-to-one correspondence mode (for convenience, only one grinding roller gap adjusting device 7 is shown in the attached drawing), the adjustment of the gap size between the upper grinding roller 4 and the lower grinding roller 4 can be achieved, the gap between the grinding roller 4 above and the grinding roller 4 below and the metal plate strip 1 can be changed, the pressure borne by abrasive particles is adjusted, and the scale layers with different strength characteristics are matched.
The outer contour of the grinding roller 4 is uniformly distributed with sawtooth structures, so that the clearance between the outer contour of the rotating grinding roller 4 and the metal plate strip 1 is periodically changed, the abrasive particles 3 have certain compressibility and difficult flowability, and the clearance between the grinding roller 4 and the metal plate strip 1 is reasonably adjusted by the grinding roller gap adjusting device 7, so that sufficient extrusion grinding force can be generated between the abrasive particles 3 and the metal plate strip 1, and the surface scale can be crushed and scraped.
The grinding roller 4 can perform rotary motion opposite to the direction of the metal plate strip 1 passing through the plate, because the side surface/section shape of the grinding roller 4 is zigzag, when the grinding roller 4 rotates, the abrasive particles 3 filled between the zigzag are carried and pressed towards the plate surface of the metal plate strip 1, and the abrasive particles 3 have the characteristic of difficult flowing and limited compressibility, so that the side surface of the zigzag can transmit the pressing force to the abrasive particles 3 which are in direct contact with the metal plate strip 1 at the surface of the metal plate strip 1. Referring to fig. 5, from the "start" position to the "end" position (90 ° range), the teeth of the rotating grinding roll 4 can generate an extrusion force on the metal strip 1, and taking a certain "middle" position as an example shown in the figure, at this time, densely-packed abrasive particles 3 are between the front and rear teeth of the grinding roll 4, so that the extrusion force of the tooth surface on the abrasive particles 3 when the grinding roll 4 rotates can be finally transmitted to the abrasive particles 3 directly contacting the strip surface, and an extrusion force F is generated, and F can be decomposed into a horizontal force Fh parallel to the metal strip 1 and a vertical force Fv perpendicular to the metal strip 1, and the gap between the grinding roll 4 and the metal strip 1 can be reasonably adjusted by the roll gap adjusting mechanism 7, so that a sufficient vertical force Fv can be obtained to achieve destructive press-in of the scale layer on the surface of the metal strip 1, and at the same time, the horizontal force Fh achieves tangential scraping of the crushed and isolated scale layer, and the above effects are combined, and finally the removal of the scale layer on the surface is achieved. Further, different gaps may correspond to different strength characteristics of the scale layer: the steel grade easy to scale such as Q235 can be adjusted to use a larger roll gap clearance, and medium-low grinding pressure is used for descaling; and for steel types which are difficult to descale, such as stainless steel, the small roll gap clearance can be adjusted and used, and large grinding pressure is used for descaling.
Referring to fig. 2, the grinding roll 4 is a linear contour grinding roll 20, side dams 22 are disposed at outer sides of both ends of the linear contour grinding roll 20, the side dams 22 cover both sides of the metal strip 1 and the linear contour grinding roll 20, preferably, the side dams 22 are V-shaped, and upper and lower ends of the side dams 22 extend to inner edges of the upper grinding roll and the lower grinding roll, respectively, so as to prevent abrasive particles from escaping from edges of the metal strip 1 during descaling operation of the linear contour grinding roll 20.
Referring to fig. 3, the grinding roller 4 is a curved profile grinding roller 21, the curved profile grinding roller 21 is a curved roller with a small middle roller diameter and large two end roller diameters, a long and narrow elliptical space with a large middle gap and small gaps at two sides is formed between two curved profile grinding rollers 21 which are symmetrically arranged up and down, when the metal plate strip 1 passes through the long and narrow elliptical space, the rotating curved profile grinding roller 21 can generate a larger extrusion acting force on abrasive particles in the gaps at two sides, so that the extrusion grinding force on the edge area of the metal plate strip 1 is enhanced, the processing capacity of the metal plate strip 1 is enhanced, and the problem that the typical 'middle thin and edge thick' of the scale on the surface of the metal plate strip 1 is solved.
Referring to fig. 4, preferably, the curved profile grinding roll 21 can axially move, and the width of the narrow elliptical space between the upper and lower rolls can be changed to match the metal plate strip 1 with different width specifications; when the metal plate strip 1 with the limit width specification is processed, the curved profile grinding roller 21 does not generate relative movement; when the narrow-specification metal plate strip 1 is processed, the curved contour grinding roller 21 performs relative movement according to the width value of the metal plate strip 1, so that a gap between the edge of the metal plate strip 1 and the curved contour grinding roller 21 is always kept at a fixed value, the size of a working area is reduced on the premise of not reducing the descaling capacity, namely, the total amount of abrasive particles 3 participating in grinding work is reduced, and the energy consumption and the abrasive loss of the descaling work are reduced.
The grain size of the abrasive particles 3 is 40-100 meshes, and the material can be Al 2 O 3 Garnet, siC, WC, cast steel grit, cast iron grit and the like, the hardness of which is HRC (Rockwell hardness) 45-65, and the particle shape of which is a polyhedron with a plurality of sharp corners and sharp edges, wherein the sharp corners and the sharp edges can obviously improve the grinding efficiency. Therefore, the effective abrasive grains 3 have a grain size of 40 to 100 mesh, and the ineffective abrasive grains are those having a grain size smaller than 100 mesh due to abrasion and breakage.
The descaling box body 2 is internally provided with a filtering screen 9, the filtering screen 9 is positioned below the lower grinding roller, and the aperture of the mesh of the filtering screen 9 is slightly smaller than the outer diameter of the effective abrasive particles 3 which can participate in grinding and descaling, so that the effective abrasive particles are separated from scales and ineffective abrasive particles for the first time.
The front side of the filtering screen 9 is provided with a front baffle 11, the rear side of the filtering screen 9 is provided with a rear baffle 12, gaps are respectively reserved between the upper ends of the front baffle 11 and the rear baffle 12 and the metal plate strip 1, a working area where the lower grinding roller is located can be always kept in a state of being filled with the abrasive particles 3, the redundant abrasive particles 3 can overflow out through the gaps between the front baffle 11 and the rear baffle 12 and the metal plate strip 1, and fine ineffective abrasive particles and scales removed from the metal plate strip 1 can fall into the collecting groove 10 through the aperture of the filtering screen 9.
The side end face of the collecting groove 10 is of an inclined plane structure, the inclined plane and the horizontal plane form an included angle of not less than 40 degrees, the inclined plane and the horizontal plane can be preferably adjusted between a 40-degree inclined plane and a 90-degree vertical plane, and a large inclination angle ensures that all solid particles and liquid entering the collecting groove 10 can be collected to the lowest part of the collecting groove 10 through the action of gravity without being detained, so that the solid particles and the liquid can be conveniently recycled.
An upper transition guide plate 16 and a lower transition guide plate 17 are arranged in the descaling box body 2, the upper transition guide plate 16 is arranged between two adjacent upper grinding rollers in parallel, the lower transition guide plate 17 is arranged between two adjacent lower grinding rollers in parallel, the lengths of the upper transition guide plate 16 and the lower transition guide plate 17 are respectively equivalent to the width of the descaling box body 2, the cross section of the upper transition guide plate 16 is of a trapezoid structure with a wide upper part and a narrow lower part, the upper end of the upper transition guide plate 16 is connected with the top surface of the descaling box body 2, the cross section of the lower transition guide plate 17 is of a trapezoid structure with a narrow upper part and a wide lower part, the lower end of the lower transition guide plate 17 is close to the filter screen 9, the upper transition guide plate 16 and the lower transition guide plate 17 can adopt a totally-closed structure, and abrasive particles are prevented from entering. The upper transition guide plate 16 and the lower transition guide plate 17 have the following functions: on one hand, the smooth passing of the head and the tail of the metal plate strip 1 is facilitated, on the other hand, the total amount of the abrasive particles 3 required to be filled in the descaling box body 2 during the descaling operation period can be greatly reduced, and the consumption cost of the abrasive particles 3 is reduced.
Referring to fig. 6, a method for grinding and descaling a metal plate strip includes the following steps:
step 1: the abrasive supply device 5 feeds the abrasive grains 3 into the descaling box 2 through the recovery feed passage 6.
Step 2: the sheet metal strip 1 enters the descaling box 2 through the entrance slit 14 and is driven between the upper and lower grinding rolls.
And step 3: the upper grinding roller and the lower grinding roller are driven to do rotary motion, so that the abrasive particles 3 grind and descale the surface of the metal plate strip 1. The rotation directions of the upper grinding roller and the lower grinding roller are opposite to the transmission direction of the metal plate strip 1. The distance between the upper grinding roller and the lower grinding roller and the metal plate strip 1 is adjusted through the grinding roller gap adjusting device 7, and the grinding efficiency and quality are ensured.
Preferably, the grinding roller 4 can be driven by a motor or a hydraulic motor or the like in the prior art to realize rotary motion, so that the rotating direction of the grinding roller is opposite to the direction of the through plate of the metal plate strip 1, and the rotation speed can be continuously adjusted by controlling a frequency converter or a hydraulic valve bank.
And 4, step 4: the metal plate strip 1 after grinding and descaling is washed by a plurality of washing nozzles 8 through a water pump 18 and then horizontally transmitted to an outlet slit 15.
And 5: the ineffective abrasive particles are filtered by the filtering screen 9 and the abrasive particles 3 and the liquid are collected in the collecting tank 10.
Step 6: particles and liquid in the collecting tank 10 pass through the separating and filtering device 13, the separating and filtering device 13 conveys effective abrasive particles 3 to the abrasive supplying device 5, outputs ineffective abrasive particles and scales to the collecting tank 19, and conveys the filtered clean water body to the flushing nozzle 8 through the water pump 18.
And 7: and (5) circulating the steps 3 to 6 until the strip tail of the metal strip 1 is output from the outlet slit 15 of the descaling box body 2.
Example 1:
taking the implementation of descaling of ordinary carbon steel with a conventional width as an example, referring to the attached drawings 1 and 2, the specific implementation mode is as follows:
the metal plate strip 1 in the embodiment is hot-rolled strip steel with the width of 1300-1600 mm and the steel grade of the hot-rolled strip steel is plain carbon steel Q235B. The scale on the surface of the steel type metal plate strip 1 is easy to remove, and the thickness difference of the scale layer in the width direction is small, so that for the scale removal of the metal plate strip 1 with the specification, the grinding roller 4 is a linear profile grinding roller 20 shown in the attached figure 2; during the descaling work of the grinding rod 4, the distance between the grinding rod 4 and the metal plate strip 1 (the distance between the highest point of the tooth surface and the metal plate strip 1) is equal to the medium distance, and preferably, the medium distance is 20 to 30mm; the grinding particles 3 are preferably cast steel grit grinding materials with the particle size of 50 to 80 meshes and the hardness of HRC56 to 60. The surface of the descaled metal plate strip 1 has no scale residue, is clean and has standard surface roughness.
Example 2:
taking the descaling of high-strength steel with conventional width and thicker edge scale as an example, referring to fig. 1 and 3, the specific implementation mode is as follows:
the metal plate strip 1 in the embodiment is a hot-rolled strip steel with the width of 1300-1600 mm, and the steel grade is high-strength steel B600L for automobile structures. The scale on the surface of the steel type metal plate strip 1 is difficult to remove, and the thickness of the scale on the edge of the metal plate strip 1 is obviously larger than that of the middle part of the metal plate strip 1, so that the problem that the scale on the edge is difficult to remove exists, therefore, for the scale removal of the metal plate strip 1 with the specification, the grinding rod 4 adopts a curve profile grinding rod 21 shown in the attached drawing 3 to strengthen the treatment of the scale on the edge; during the descaling work period of the grinding rod 4, the distance between the middle part of the grinding rod 4 and the metal plate strip 1 is a medium-small distance, preferably, the medium-small distance is 15-20mm, the distance corresponds to the end part of the metal plate strip 1, the distance between the grinding rod 4 and the metal plate strip 1 is a small distance, preferably, the small distance is 10-15mm; the grinding particles 3 are preferably cast steel sand grinding materials with the particle size of 50-80 meshes and the hardness of HRC 60-65. The surface of the descaled metal plate strip 1 has no scale residue, is clean and has standard surface roughness.
Example 3:
taking the descaling of high-strength steel with narrow width specification and thicker edge scale as an example, referring to the attached drawings 1 and 4, the specific implementation mode is as follows:
the metal plate strip 1 in the embodiment is a hot-rolled strip steel with the width of 900-1300 mm, and the steel grade is high-strength steel B600L for automobile structures. The scale on the surface of the steel type metal plate strip 1 is difficult to remove, the thickness of the scale on the edge of the metal plate strip 1 is obviously larger than that of the middle part of the metal plate strip 1, the problem that the scale on the edge is difficult to remove exists, and meanwhile, the width of the metal plate strip 1 is considered to be narrow, so for the scale removal of the metal plate strip 1 with the specification, a curved profile grinding rod 21 shown in the attached drawing 4 is selected as the grinding rod 4, the curved profile grinding rod 21 has the axial moving capacity, and the calculation formula of the axial moving distance L is as follows:
play distance L = 1300-actual strip width W
Note: 1. the play distance L is the dislocation between the upper roller and the lower roller;
2. the corresponding scale removal width range is 1300-1600 mm when the scale is not moved.
Therefore, the volume of a working area can be reduced on the premise of not reducing the edge descaling capability, so that the abrasive loss and the descaling working energy consumption are reduced; during the descaling work of the grinding rod 4, the distance between the middle part of the grinding rod 4 and the metal plate strip 1 is a medium-small distance, preferably, the medium-small distance is 15-20mm, and the distance corresponds to the end part of the metal plate strip 1, the distance between the grinding rod 4 and the metal plate strip 1 is a small distance, preferably, the small distance is 10-15mm; the grinding particles 3 are preferably cast steel sand grinding materials with the particle size of 50 to 80 meshes and the hardness of HRC60 to 65. The surface of the descaled metal plate strip 1 has no scale residue, is clean and has standard surface roughness.
The present invention is not limited to the above embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and scope of the present invention should be construed as being included in the present invention.
Claims (6)
1. The utility model provides a sheet metal strip grinding descaling device which characterized by: comprises a descaling box body (2), abrasive particles (3), a grinding roller (4), an abrasive supplying device (5), a recovery feeding channel (6), a collecting tank (10) and a separation filtering device (13); an inlet slit (14) and an outlet slit (15) are respectively arranged in the middle of the front end and the rear end of the descaling box body (2), so that the metal plate strip (1) enters the descaling box body (2) through the inlet slit (14) and is output through the outlet slit (15); the grinding rollers (4) are arranged in the descaling box body (2), the grinding rollers (4) comprise a plurality of upper grinding rollers which are distributed above the metal plate strip (1) at intervals and a plurality of lower grinding rollers which are distributed below the metal plate strip (1) at intervals, and the upper grinding rollers and the lower grinding rollers are in one-to-one correspondence and are symmetrically arranged relative to the metal plate strip (1); the grinding material recycling and feeding device comprises a plurality of recycling and feeding channels (6), a grinding material supplying device (5) and a grinding material feeding device (4), wherein the recycling and feeding channels (6) are respectively arranged at the top of a descaling box body (2) at intervals and are connected with an outlet of the grinding material supplying device (5), the recycling and feeding channels (6) are respectively and correspondingly positioned above a plurality of upper grinding rollers, grinding material particles (3) are stored in the grinding material supplying device (5) and are input into the descaling box body (2) through the recycling and feeding channels (6), and the grinding material particles (3) are extruded and rubbed with scale on the surface of a metal plate strip (1) through the rotating grinding rollers (4); the collecting tank (10) is arranged at the bottom of the descaling tank body (2) and is communicated with the descaling tank body (2), an outlet at the bottom of the collecting tank (10) is connected with an inlet of the separation filtering device (13), an effective particle outlet of the separation filtering device (13) is connected with an inlet of the abrasive supplying device (5), so that effective abrasive particles (3) accumulated in the collecting tank (10) are recycled into the abrasive supplying device (5), and an ineffective particle outlet of the separation filtering device (13) is connected with the collecting barrel (19);
the rear end of the interior of the descaling box body (2) is provided with a plurality of flushing nozzles (8), the plurality of flushing nozzles (8) are symmetrically arranged above and below the metal plate strip (1) and are connected with a water outlet of a water pump (18), the nozzle outlet directions of the plurality of flushing nozzles (8) form acute included angles with the metal plate strip (1), and a water inlet of the water pump (18) is connected with a liquid outlet of a separation filtering device (13);
saw tooth structures are uniformly distributed on the outer contour of the grinding roller (4), so that the gap between the outer contour of the rotating grinding roller (4) and the metal plate strip (1) is periodically changed;
the grinding roller (4) is a curved profile grinding roller (21), the curved profile grinding roller (21) is a curved roller with small middle roller diameter and large two-end roller diameter, a long and narrow oval space with large middle gap and small two-side gap is formed between the two curved profile grinding rollers (21) which are symmetrically arranged up and down, and the curved profile grinding roller (21) can axially move.
2. A metal strip grinding and descaling device according to claim 1, wherein: the descaling box body (2) is provided with a plurality of grinding roller gap adjusting devices (7), one ends of the grinding roller gap adjusting devices (7) are arranged in the descaling box body (2) and connected with the grinding rollers (4), and the grinding rollers (4) move up and down through the grinding roller gap adjusting devices (7).
3. A sheet metal strip grinding and descaling device as defined in claim 1, wherein: the granularity range of the abrasive particles (3) is 40-100 meshes, the abrasive particles (3) are in a polyhedral structure with a plurality of sharp corners and sharp edges on the surface, and the hardness of the abrasive particles (3) is HRC45-65.
4. A sheet metal strip grinding and descaling device as defined in claim 1, wherein: and a filtering screen (9) is arranged in the descaling box body (2), the filtering screen (9) is positioned below the lower grinding roller, and the aperture of the meshes of the filtering screen (9) is smaller than the outer diameter of the effective abrasive particles (3).
5. A strip grinding and descaling apparatus according to claim 4, wherein: the front side of the filtering screen (9) is provided with a front baffle (11), the rear side of the filtering screen (9) is provided with a rear baffle (12), and gaps are respectively reserved between the front baffle (11) and the rear baffle (12) and the metal plate strip (1).
6. A grinding and descaling method using the metal strip grinding and descaling device according to claim 1, characterized in that: the method comprises the following steps:
step 1: the abrasive supplying device (5) sends the abrasive particles (3) into the descaling box body (2) through the recovery feeding channel (6);
and 2, step: the metal plate strip (1) enters the descaling box body (2) from the entrance slit (14) and is transmitted between the upper grinding roller and the lower grinding roller;
and step 3: driving an upper grinding roller and a lower grinding roller to do rotary motion, so that the abrasive particles (3) grind and descale the surface of the metal plate strip (1);
and 4, step 4: the metal plate strip (1) after grinding and descaling is washed by a plurality of washing nozzles (8) through a water pump (18) and then horizontally transmitted to an outlet slit (15);
and 5: the abrasive particles (3) and the liquid are collected in a collecting tank (10);
and 6: particles and liquid in the collecting tank (10) pass through a separation filtering device (13), the separation filtering device (13) conveys effective abrasive particles (3) to an abrasive material supply device (5), outputs ineffective abrasive particles and scales to a collecting tank (19), and conveys the filtered clean water body to a flushing nozzle (8) through a water pump (18);
and 7: and (5) circulating the steps 3 to 6 until the strip tail of the metal strip (1) is output out of an outlet slit (15) of the descaling box body (2).
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| CN201910504270.9A CN112077158B (en) | 2019-06-12 | 2019-06-12 | Metal plate strip grinding and descaling device and method |
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| SU878525A2 (en) * | 1977-02-10 | 1981-11-07 | Предприятие П/Я А-1001 | Device for magnetic-abrasive working of sheet material |
| DE3600144A1 (en) * | 1986-01-07 | 1987-07-09 | Schloemann Siemag Ag | ARRANGEMENT FOR REMOVING TIN, FROM HOT ROLLED STEEL TAPES |
| JPH10156679A (en) * | 1996-12-03 | 1998-06-16 | Sony Corp | Grinding device for wafer back surface and grinding method for wafer back surface |
| CN102452032A (en) * | 2010-10-29 | 2012-05-16 | 宝山钢铁股份有限公司 | Mechanical descaling method |
| CN103419113A (en) * | 2012-05-25 | 2013-12-04 | 宝山钢铁股份有限公司 | Novel metal plate strip surface cleaning method and device |
| CN106140840B (en) * | 2015-03-30 | 2018-09-04 | 宝山钢铁股份有限公司 | A kind of strip surface scale removal equipment and its method |
| CN105215855B (en) * | 2015-08-21 | 2017-04-26 | 太原科技大学 | Device for performing throwing and spraying descaling on metal strips by means of abrasive slurry |
| CN105583737B (en) * | 2016-03-14 | 2018-05-11 | 中冶赛迪工程技术股份有限公司 | A kind of wet type ramming scale removal equipment |
| CN208643691U (en) * | 2018-06-21 | 2019-03-26 | 张柳竹 | Belt steel surface anacidity scale removal equipment |
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